package de.tudarmstadt.informatik.hostage.ui;

import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;

import de.tudarmstadt.informatik.hostage.R;
import de.tudarmstadt.informatik.hostage.commons.HelperUtils;
import de.tudarmstadt.informatik.hostage.logging.Logger;
import de.tudarmstadt.informatik.hostage.logging.Record;
import de.tudarmstadt.informatik.hostage.logging.SQLLogger;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.preference.PreferenceManager;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.TaskStackBuilder;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;
/**
 * ViewLog shows Statistics about the recorded Attacks.
 * It also offers the user several options to perform actions with the database.
 * This includes:<br>
 * - show records,<br>
 * - export records,<br>
 * - upload records,<br>
 * - and delete records.
 * @author Lars Pandikow
 */
public class ViewLog extends Activity {
	
	public static final int JSON = 0x01;
	
	private final SimpleDateFormat sdf = new SimpleDateFormat("MMM dd,yyyy HH:mm", Locale.US);

	private Logger logger;
	private SharedPreferences pref;
	private Editor editor;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_viewlog);
		logger = new SQLLogger(this);
		pref = PreferenceManager.getDefaultSharedPreferences(this);
		editor = pref.edit();
		initStatistic();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	    // Handle item selection
	    switch (item.getItemId()) {
	        case R.id.action_settings:
	            startActivity(new Intent(this, SettingsActivity.class));
	            break;
	        case R.id.action_about:
	            startActivity(new Intent(this, AboutActivity.class));
	            break;
	        default:
	    }
        return super.onOptionsItemSelected(item);
	}

	/**
	 * Creates a Dialog to choose export format.
	 * Then calls {@link ViewLog#exportDatabase(int)}
	 * @param view View elements which triggers the method call.
	 */
	public void exportDatabase(View view) {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(R.string.export_dialog_title);
		builder.setItems(R.array.format, new DialogInterface.OnClickListener() {
			public void onClick(DialogInterface dialog, int position) {
				exportDatabase(position);
			}
		});
		builder.create();
		builder.show();
	}
	
	/**
	 * Exports all records in a given format. Before exporting checks export location from preferences.
	 * @param format Integer coded export format
	 * @see Record#toString(int)
	 */
	private void exportDatabase(int format){
		try {
			FileOutputStream log;
			String filename = "hostage_" + format + "_" + System.currentTimeMillis() + ".log";
			boolean externalStorage = pref.getBoolean("pref_external_storage", false);
			String externalLocation = pref.getString("pref_external_location", "");
			if(externalStorage){
				String root = Environment.getExternalStorageDirectory().toString();
				if(root != null && HelperUtils.isExternalStorageWritable()){					
					File dir = new File(root + externalLocation);
					dir.mkdirs();
					File file = new File(dir, filename);
					log = new FileOutputStream(file);
				}else {
					Toast.makeText(this, "Could not write to SD Card", Toast.LENGTH_SHORT).show();
					return;
				}

			} else{
				log = this.openFileOutput("hostage_" + format + "_" + System.currentTimeMillis() + ".log", Context.MODE_PRIVATE);
			}
			
			ArrayList<Record> records = logger.getAllRecords();
			for(Record record : records){
					log.write((record.toString(format) + "\n").getBytes());
			}
			log.flush();
			log.close();
			Toast.makeText(this, externalStorage ? filename + " saved on external memory! " + externalLocation : filename + " saved on internal memory!", Toast.LENGTH_LONG).show();
		} catch (Exception e) {
			Toast.makeText(this, "Could not write to SD Card", Toast.LENGTH_SHORT).show();
			e.printStackTrace();
		}	
	}
	
	/**
	 * Uploads a JSON Representation of each attack to a server, specified in the preferences.<br>
	 * The method only uploads information about attacks that have net been uploaded yet.
	 * For the Upload it uses a HttpPost with a HttpsClient, which does not validate any certificates.<br>
	 * The Upload runs in its own Thread.<br>
	 * While uploading the method also creates a notification to inform the user about the status of the upload.
	 * @param  view View elements which triggers the method call.
	 * @see de.tudarmstadt.informatik.hostage.net.MySSLSocketFactory
	 */
	public void uploadDatabase(View view){
		//Create a Notification
		final NotificationCompat.Builder builder;
		final NotificationManager mNotifyManager;
		final int lastUploadedAttackId = pref.getInt("LAST_UPLOADED_ATTACK_ID", -1);
		int currentAttackId = pref.getInt("ATTACK_ID_COUNTER", 0);
		// Check if there are new records to upload
		if(lastUploadedAttackId == currentAttackId -1){
			// Inform user that no upload is necessary
			Toast.makeText(this, "All data have already been uploaded.", Toast.LENGTH_SHORT).show();
			return;
		}
		// Build and show Upload Notification in notification bar
		builder = new NotificationCompat.Builder(this)
							.setContentTitle(this.getString(R.string.app_name))
							.setContentText("Upload in progress...")
							.setTicker("Uploading Data...")
							.setSmallIcon(R.drawable.ic_launcher)	
							.setWhen(System.currentTimeMillis());	
		TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
		stackBuilder.addParentStack(MainActivity.class);
		stackBuilder.addNextIntent(new Intent());
		PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,
				PendingIntent.FLAG_UPDATE_CURRENT);
		builder.setContentIntent(resultPendingIntent);
		builder.setAutoCancel(true);
		builder.setOnlyAlertOnce(false);
		mNotifyManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
		mNotifyManager.notify(2, builder.build());
		// Create a new Thread for upload
		new Thread(new Runnable() {
			  public void run() {	
				  	// Create a https client. Uses MySSLSocketFactory to accept all certificates
					HttpClient httpclient = HelperUtils.createHttpClient();
					// get RecordList
					ArrayList<Record> recordList = logger.getRecordOfEachAttack(lastUploadedAttackId);
					final int progressMax = recordList.size();		
					Log.i("SQLLogger", "Logs to upload: " + progressMax);	
							HttpPost httppost;
							int progressBarStatus = 0;
							for(Record record: recordList){
								Log.i("SQLLogger", "Uploading log: " + progressBarStatus);
								try {
								// Create HttpPost
								httppost = new HttpPost(pref.getString("pref_upload", "https://ssi.cased.de"));
								// Create JSON String of Record
								StringEntity se = new StringEntity(record.toString(JSON));
								httppost.setEntity(se);
								// Execute HttpPost
								HttpResponse response = httpclient.execute(httppost);
								Log.i("SQLLogger", "Statuscode of log "  + progressBarStatus + ": " + " " + response.getStatusLine().getReasonPhrase());	
								Log.i("SQLLogger", "Statuscode of log "  + progressBarStatus + ": " + " " + response.getStatusLine().getStatusCode());	
								// Update Notification progress bar
								progressBarStatus++;								
								builder.setProgress(progressMax, progressBarStatus, false);
			                     // Update the progress bar
								mNotifyManager.notify(2, builder.build());
								} catch (Exception e) {
									Log.i("SQLLogger", "Failed");
									e.printStackTrace();
								}
							}
							
					if(progressBarStatus == progressMax){
						// When the loop is finished, updates the notification
			            builder.setContentText("Upload complete")
			            	   .setTicker("Upload complete")
			            // Removes the progress bar
			                   .setProgress(0,0,false);
			            mNotifyManager.notify(2, builder.build());
			        }
			}}).start();
		editor.putInt("LAST_UPLOADED_ATTACK_ID",currentAttackId - 1);
		editor.commit();				
	}

	/**
	 * Starts a ViewLogTable Activity.
	 * @param view View elements which triggers the method call.
	 * @see ViewLogTable
	 */
	public void showLog(View view) {
		startActivity(new Intent(this, ViewLogTable.class));
	}

	/**
	 * Creates a Dialog that lets the user decide which criteria he want to use to delete records.
	 * Then calls the corresponding method.
	 * @param view View elements which triggers the method call.
	 * @see ViewLog#deleteByBSSID()
	 * @see ViewLog#deleteByDate()
	 * @see ViewLog#deleteAll()
	 */
	public void deleteLog(View view) {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);

		builder.setTitle(R.string.delete_dialog_title);
		builder.setItems(R.array.delete_criteria,
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int position) {
						switch (position) {
						case 0:
							deleteByBSSID();
							break;
						case 1:
							deleteByDate();
							break;
						case 2:
							deleteAll();
						}
					}
				});
		builder.create();
		builder.show();
	}
	
	/**
	 * Shows a List with all recorded BSSIDs.
	 * If a BSSID is selected the method calls {@link Logger#deleteByBSSID(String)} to delete all records with the chosen BSSID
	 * @see Logger#deleteByBSSID
	 */
	private void deleteByBSSID() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		final String[] bssidArray = logger.getAllBSSIDS();
		for(int i = 0; i < bssidArray.length; i++){
			bssidArray[i] = bssidArray[i] + " (" + logger.getSSID(bssidArray[i]) +")";
		}
		builder.setTitle(R.string.delete_dialog_title);
		builder.setItems(bssidArray, new DialogInterface.OnClickListener() {
			@SuppressLint("NewApi")
			public void onClick(DialogInterface dialog, int position) {
				logger.deleteByBSSID(bssidArray[position]);
				Toast.makeText(
						getApplicationContext(),
						"All entries with bssid '" + bssidArray[position]
								+ "' deleted.", Toast.LENGTH_SHORT).show();
				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
					recreate();
				} else {
					Intent intent = getIntent();
					finish();
					startActivity(intent);
				}
			}
		});
		builder.create();
		builder.show();
	}

	/**
	 * Creates a DatePicking Dialog where the user can choose a date. Afterwards {@link ViewLog#deleteByDate(int, int, int)} is called.
	 */
	private void deleteByDate() {
		showDialog(0);
	}


	@Override
	protected Dialog onCreateDialog(int id) {
		switch (id) {
		case 0:
			final Calendar cal = Calendar.getInstance();
			int pYear = cal.get(Calendar.YEAR);
			int pMonth = cal.get(Calendar.MONTH);
			int pDay = cal.get(Calendar.DAY_OF_MONTH);
			return new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
				public void onDateSet(DatePicker view, int year, int monthOfYear,
						int dayOfMonth) {deleteByDate(year, monthOfYear, dayOfMonth);}}
			, pYear, pMonth, pDay);
		}
		return null;
	}

	/**
	 * Shows a Dialog with the given date and ask him to confirm deleting records that are older than the shown date.
	 * When the user confirms {@link Logger#deleteByDate(long)} is called with a long representation of the Date.
	 * If the user cancels the Dialog nothing happens and the dialog disappears.
	 * @param year
	 * @param monthOfYear
	 * @param dayOfMonth
	 */
	private void deleteByDate(int year, int monthOfYear, int dayOfMonth) {
		TimePicker timePicker = new TimePicker(this);
		final Calendar calendar = Calendar.getInstance();
		calendar.set(year, monthOfYear, dayOfMonth,
				timePicker.getCurrentHour(), timePicker.getCurrentMinute(), 0);
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(R.string.dialog_clear_database_date)
				.setMessage(sdf.format(calendar.getTime()))
				.setPositiveButton(R.string.delete,
						new DialogInterface.OnClickListener() {
							@SuppressLint("NewApi")
							public void onClick(DialogInterface dialog, int id) {
								long time = calendar.getTimeInMillis();
								// Delete Data
								logger.deleteByDate(time);
								Toast.makeText(getApplicationContext(),
										"Data sets deleted!",
										Toast.LENGTH_SHORT).show();
								// Recreate the activity
								if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
									recreate();
								} else {
									Intent intent = getIntent();
									finish();
									startActivity(intent);
								}
							}
						})
				.setNegativeButton(R.string.cancel,
						new DialogInterface.OnClickListener() {
							public void onClick(DialogInterface dialog, int id) {
								// User cancelled the dialog
							}
						});
		// Create the AlertDialog object
		builder.create();
		builder.show();
	}

	/**
	 * Shows a Dialog to confirm that the database should be cleared.
	 * If confirmed {@link SQLLogger#clearData()} is called.
	 * @see Logger#clearData()
	 */
	private void deleteAll() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage(R.string.dialog_clear_database)
				.setPositiveButton(R.string.clear,
						new DialogInterface.OnClickListener() {
							@SuppressLint("NewApi")
							public void onClick(DialogInterface dialog, int id) {
								// Clear all Data
								logger.clearData();
								editor.putInt("ATTACK_ID_COUNTER", 0);
								editor.putInt("LAST_UPLOADED_ATTACK_ID", -1);
								editor.commit();
								Toast.makeText(getApplicationContext(),
										"Database cleared!", Toast.LENGTH_SHORT)
										.show();
								// Recreate the activity
								if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
									recreate();
								} else {
									Intent intent = getIntent();
									finish();
									startActivity(intent);
								}
							}
						})
				.setNegativeButton(R.string.cancel,
						new DialogInterface.OnClickListener() {
							public void onClick(DialogInterface dialog, int id) {
								// User cancelled the dialog
							}
						});
		// Create the AlertDialog object
		builder.create();
		builder.show();
	}

	/**
	 * Initializes the Statistics. Creates a table row for every protocol and checks the dabase for the attack count.
	 * Calls {@link ViewLog#setFirstAndLastAttack()} to set the TextViews.
	 * @see Logger#getAttackCount()
	 * @see Logger#getAttackPerProtokolCount(String)
	 */
	private void initStatistic() {
		TableLayout table = (TableLayout) findViewById(R.id.layoutContainer);

		ArrayList<String> protocols = new ArrayList<String>();
		protocols.add("Total");
		protocols.addAll(Arrays.asList(getResources().getStringArray(
				R.array.protocols)));

		for (String protocol : protocols) {
			TableRow row = new TableRow(this);
			TextView protocolName = new TextView(this);
			protocolName.setBackgroundResource(R.color.dark_grey);
			protocolName.setText(protocol);
			protocolName.setTextAppearance(this,
					android.R.style.TextAppearance_Medium);
			protocolName.setPadding(6, 0, 0, 0);
			row.addView(protocolName);
			TextView value = new TextView(this);
			value.setBackgroundResource(R.color.light_grey);
			value.setTextAppearance(this, android.R.style.TextAppearance_Medium);
			value.setGravity(Gravity.RIGHT);
			value.setPadding(3, 0, 3, 0);
			row.addView(value);
			if (protocol.equals("Total")) {
				value.setText("" + logger.getAttackCount());
			} else {
				value.setText("" + logger.getAttackPerProtokolCount(protocol));
			}
			table.addView(row);
		}
		setFirstAndLastAttack();
	}

	/**
	 * Sets the TextViews for first and last attack.
	 * @see Logger#getSmallestAttackId()
	 * @see Logger#getHighestAttackId()
	 * @see Logger#getRecordOfAttackId(long)
	 */
	private void setFirstAndLastAttack() {
		Record firstAttack = logger.getRecordOfAttackId(logger.getSmallestAttackId());
		Record lastAttack = logger.getRecordOfAttackId(logger.getHighestAttackId());
		if (firstAttack != null) {
			Date resultdate = new Date(firstAttack.getTimestamp());
			TextView text = (TextView) findViewById(R.id.textFirstAttackValue);
			text.setText(sdf.format(resultdate));
			text = (TextView) findViewById(R.id.textLastAttackValue);
			resultdate = new Date(lastAttack.getTimestamp());
			text.setText(sdf.format(resultdate));
		} else {
			TextView text = (TextView) findViewById(R.id.textFirstAttackValue);
			text.setText("-");
			text = (TextView) findViewById(R.id.textLastAttackValue);
			text.setText("-");
		}
	}
}